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  <title>Constructs a new SyncSharedMemory object</title>
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    <li>Constructs a new SyncSharedMemory object</li>
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  <div id="layout-content"><div id="syncsharedmemory.construct" class="refentry">
 <div class="refnamediv">
  <h1 class="refname">SyncSharedMemory::__construct</h1>
  <p class="verinfo">(PECL sync &gt;= 1.1.0)</p><p class="refpurpose"><span class="refname">SyncSharedMemory::__construct</span> &mdash; <span class="dc-title">Constructs a new SyncSharedMemory object</span></p>

 </div>

 <div class="refsect1 description" id="refsect1-syncsharedmemory.construct-description">
  <h3 class="title">说明</h3>
  <div class="methodsynopsis dc-description">
   <span class="modifier">public</span> <span class="methodname"><strong>SyncSharedMemory::__construct</strong></span>(<span class="methodparam"><span class="type">string</span> <code class="parameter">$name</code></span>, <span class="methodparam"><span class="type">int</span> <code class="parameter">$size</code></span>)</div>

  <p class="para rdfs-comment">
   Constructs a named shared memory object.
  </p>
 </div>


 <div class="refsect1 parameters" id="refsect1-syncsharedmemory.construct-parameters">
  <h3 class="title">参数</h3>
  <dl>
   
    <dt>
<code class="parameter">name</code></dt>

    <dd>

     <p class="para">
      The name of the shared memory object.
     </p>
     <blockquote class="note"><p><strong class="note">注意</strong>: 
      <p class="para">
       If the name already exists, it must be able to be opened by the current user
       that the process is running as or an exception will be thrown with a meaningless
       error message.
      </p>
     </p></blockquote>
    </dd>

   
   
    <dt>
<code class="parameter">size</code></dt>

    <dd>

     <p class="para">
      The size, in bytes, of shared memory to reserve.
     </p>
     <blockquote class="note"><p><strong class="note">注意</strong>: 
      <p class="para">
       The amount of memory cannot be resized later.  Request sufficient storage up front.
      </p>
     </p></blockquote>
    </dd>

   
  </dl>

 </div>


 <div class="refsect1 returnvalues" id="refsect1-syncsharedmemory.construct-returnvalues">
  <h3 class="title">返回值</h3>
  <p class="para">
   The new <span class="classname"><a href="class.syncsharedmemory.html" class="classname">SyncSharedMemory</a></span> object.
  </p>
 </div>


 <div class="refsect1 errors" id="refsect1-syncsharedmemory.construct-errors">
  <h3 class="title">错误／异常</h3>
  <p class="para">
   An exception is thrown if the shared memory object cannot be created or opened.
  </p>
 </div>


 <div class="refsect1 examples" id="refsect1-syncsharedmemory.construct-examples">
  <h3 class="title">范例</h3>
  <div class="example" id="example-3372">
   <p><strong>示例 #1 <span class="function"><strong>SyncSharedMemory::__construct()</strong></span> example</strong></p>
   <div class="example-contents">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB">&lt;?php<br /></span><span style="color: #FF8000">//&nbsp;You&nbsp;will&nbsp;probably&nbsp;need&nbsp;to&nbsp;protect&nbsp;shared&nbsp;memory&nbsp;with&nbsp;other&nbsp;synchronization&nbsp;objects.<br />//&nbsp;Shared&nbsp;memory&nbsp;goes&nbsp;away&nbsp;when&nbsp;the&nbsp;last&nbsp;reference&nbsp;to&nbsp;it&nbsp;disappears.<br /></span><span style="color: #0000BB">$mem&nbsp;</span><span style="color: #007700">=&nbsp;new&nbsp;</span><span style="color: #0000BB">SyncSharedMemory</span><span style="color: #007700">(</span><span style="color: #DD0000">"AppReportName"</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">1024</span><span style="color: #007700">);<br />if&nbsp;(</span><span style="color: #0000BB">$mem</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">first</span><span style="color: #007700">())<br />{<br />&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #FF8000">//&nbsp;Do&nbsp;first&nbsp;time&nbsp;initialization&nbsp;work&nbsp;here.<br /></span><span style="color: #007700">}<br /><br /></span><span style="color: #0000BB">$result&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">$mem</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">write</span><span style="color: #007700">(</span><span style="color: #0000BB">json_encode</span><span style="color: #007700">(array(</span><span style="color: #DD0000">"name"&nbsp;</span><span style="color: #007700">=&gt;&nbsp;</span><span style="color: #DD0000">"my_report.txt"</span><span style="color: #007700">)));<br /></span><span style="color: #0000BB">?&gt;</span>
</span>
</code></div>
   </div>

  </div>
 </div>


 <div class="refsect1 seealso" id="refsect1-syncsharedmemory.construct-seealso">
  <h3 class="title">参见</h3>
  <ul class="simplelist">
   <li class="member"><span class="methodname"><a href="syncsharedmemory.first.html" class="methodname" rel="rdfs-seeAlso">SyncSharedMemory::first()</a> - Check to see if the object is the first instance system-wide of named shared memory</span></li>
   <li class="member"><span class="methodname"><a href="syncsharedmemory.size.html" class="methodname" rel="rdfs-seeAlso">SyncSharedMemory::size()</a> - Returns the size of the named shared memory</span></li>
   <li class="member"><span class="methodname"><a href="syncsharedmemory.write.html" class="methodname" rel="rdfs-seeAlso">SyncSharedMemory::write()</a> - Copy data to named shared memory</span></li>
   <li class="member"><span class="methodname"><a href="syncsharedmemory.read.html" class="methodname" rel="rdfs-seeAlso">SyncSharedMemory::read()</a> - Copy data from named shared memory</span></li>
  </ul>
 </div>


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